Scaling and stationarity analysis of discrete time signal of Solar Radio flux
Chaiti Kumar, Amrita Prasad, Rajib Barui, Sankar Narayan Patra, Koushik Ghosh · 2014
In the present work, we have considered the daily signal of Solar Radio flux of 2800 Hz recorded daily by radio telescopes near Ottawa (operated during 14thFebruary, 1947-31stMay, 1991) and Penticton, British Columbia, Dominion Radio Astrophysical Observatory (operating since 1stJune, 1991) during the period from 29thOctober, 1972 to 28thFebruary, 2013. We have applied FIR nonlinear phase filter on the present discrete signal to denoise it. The memory of this denoising signal has been analyzed and it indicates short memory trend (anti-persistent) hidden in this spectrum. Then we have examined whether the signal possesses stationary properties. On the basis of autocorrelation analysis, quasi or partly stationary nature of the spectrum has been revealed.